I was helping raise some funds for the Salvation Army by doing Christmas Gift wrapping at the Yeppoon shopping centre, and to keep me company, there was an older guy with me, playing Christmas songs on his cornet. I was surprised by the youth of Yeppoon. Two young lads came out of the adjacent Surf Shop and one said 'listen to the old guy on the trumpet!' The other boy said 'it's not a trumpet. That's a cornet!' See, not many people can tell the difference, so I was duly impressed.
Anyway, my cornet playing friend would've played "I Saw Mummy Kissing Santa Claus" at least three times, and in the quiet times between gift wrapping, I worked on this.
Might see if I can get it done as a T-Shirt for next year, maybe...